Composite amplifier
First Claim
1. A composite amplifier including a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said composite amplifier being configured to generate, for at least one of said power amplifiers, a low power drive signal having non-constant amplitude that depends non-linearly on the amplitude of said input signal,wherein the composite amplifier is configured to form each low power drive signal as a combination of a linear drive signal component, which depends linearly on the amplitude of said input signal, and a non-linear drive signal component, which depends non-linearly on the amplitude of said input signal.
1 Assignment
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Accused Products
Abstract
A composite amplifier includes a first and a second power amplifier connected to a Chireix output network. A signal component separator and an IQ separator provide equal first and linear drive signal components that depends linearly on the amplitude A(t) of an amplitude modulated input signal. The signal component separator and IQ separator provide first and second nonlinear drive signal components that have the same magnitude but opposite signs and depend non-linearly as √1−A(t) on the amplitude A(t) and are in quadrature to the first and second linear drive signal components. Amplitude-phase adjusters individually adjust amplitudes and phases of the drive signal components to lower drive power consumption. Summers form a first composite drive signal to the first power amplifier by adding the adjusted first linear drive signal component to the adjusted first non-linear drive signal component a second composite drive signal to the second power amplifier by adding the adjusted second linear drive signal component to the adjusted second non-linear drive signal component.
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Citations
27 Claims
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1. A composite amplifier including a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said composite amplifier being configured to generate, for at least one of said power amplifiers, a low power drive signal having non-constant amplitude that depends non-linearly on the amplitude of said input signal,
wherein the composite amplifier is configured to form each low power drive signal as a combination of a linear drive signal component, which depends linearly on the amplitude of said input signal, and a non-linear drive signal component, which depends non-linearly on the amplitude of said input signal.
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10. A transmitter including a composite amplifier having a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said composite amplifier being configured to generate, for at least one of said power amplifiers, a low power drive signal having non-constant amplitude that depends non-linearly on the amplitude of said input signal,
wherein the composite amplifier is further configured to form each low power drive signal as a combination of a linear drive signal component, which depends linearly on the amplitude of said input signal, and a non-linear drive signal component, which depends non-linearly on the amplitude of said input signal.
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19. A method of driving a composite amplifier including a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said method comprising:
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generating, for at least one of said power amplifiers, a low power drive signal having non-constant amplitude that depends non-linearly on the amplitude of said input signal, and forming each low power drive signal as a combination of a linear drive signal component, which depends linearly on the amplitude of said input signal, and a nonlinear drive signal component, which depends non-linearly on the amplitude of said input signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification